<nav id="nav" class="navbar">
    <div class="container-fluid">
        <div class="navbar-header">
            <span><img src="./assets/images/WechatIMG1.jpeg"></span>
        </div>  
        <div class="collapse navbar-collapse">
            <ul class="nav navbar-nav">

                <li ui-sref-active="active"><a class="home" ui-sref="about"><span>首页</span></a></li>               
                <li ui-sref-active="active"><a class="product" ui-sref="change-info"><span>产品</span></a></li>
                <li ui-sref-active="active"><a class="down" href="#" ui-sref="userInfo"><span>下载</span></a></li>
                <li ui-sref-active="active"><a class="about-us" href="#" ui-sref="user"><span>关于我们</span></a></li>
                <li ui-sref-active="active"><a class="serve-support" href="#" ui-sref="sellerchange"><span>服务与支持</span></a></li>
            </ul>
            <div id="user">
                <a href="#"><img src=""></a>
            </div>
        </div>
    </div>
</nav>
